Comments on: Unique Fail

By: Guillaume Goulet-Vallières

Guillaume Goulet-Vallières — Wed, 13 Jun 2012 20:36:04 +0000

Very interessting. It’s nice to see with a real exemple how much impact have the data statistics and system statistics on the execution plans.

By: Randolf Geist

Randolf Geist — Sun, 10 Jun 2012 13:34:26 +0000

> In 11g, of course, you can test this hypothesis fairly simply by collecting pending stats, and then enabling them in your own session to see what effect they have, without running the risk of damaging public execution plans

Just a word of caution: At least up to 11.2.0.2 not all DBMS_STATS call are “pending” statistics mode aware, which means that some statistics manipulations will still be immediately visible although PENDING statistics have been enabled for a particular table, More details on my post:

http://oracle-randolf.blogspot.de/2011/01/pending-statistics.html

Randolf

By: Jonathan Lewis

Jonathan Lewis — Sun, 10 Jun 2012 12:36:53 +0000

Colin,

Thanks for that. In my scripts it’s after the calls to dbms_stats, and I forgot copy it.
Now updated.

By: lkafle

lkafle — Sun, 10 Jun 2012 03:30:26 +0000

Reblogged this on lava kafle kathmandu nepal.

By: Colin 't Hart

Colin 't Hart — Sat, 09 Jun 2012 14:25:02 +0000

I don’t see any DDL in your script to create that index (T1_PK)?